HP-150 Software

I have my HP-150 cleaned up now. I also have a 9121 with two single-sided floppy disk drives. I have cleaned them up, unblocking the eject mechanisms gummed up with dry grease. Now I want to get the system running. I have found the disk images on the HP Museum site. They are Teledisk images. I had not come across this program before, so I set up a DOS machine and tried using Teledisk to write to a double-sided double-density disk I have. It seemed to work, getting to the last track and then complained about the disk drive not being ready. I tried the disk in the HP-150 in any case and it booted up ok, although I think one of the files may not have been right, so perhaps the disk is not fully written. I wanted to convert the TD0 files to IMD format (Dave Dunfield's ImageDisk program) as that is more legal than using Teledisk, but ImageDisk seems to struggle reading the floppy disks that I managed to create with Teledisk. Has anyone converted these TD0 images to IMD already? Regards Rob